code: def setUpClass(cls):
      cls.num_samples = 7
      cls.bayered_imgs, cls.npp_baseline = prepare_test_imgs(
          cls.num_samples, dtype=np.uint8
      )
      cls.bayered_imgs16t, cls.npp_baseline16t = prepare_test_imgs(
          cls.num_samples, dtype=np.uint16
      )
  
imports: import itertools
  import os
  import unittest
  import numpy
  from nvidia.dali import pipeline_def, fn, types
  from test_utils import get_dali_extra_path
  from nose_utils import assert_raises
  from nose2.tools import params
  from debayer_test_utils import bayer_patterns, blue_position, blue_position2pattern, rgb2bayer, rgb2bayer_seq, debayer_bilinear_npp_pattern, debayer_bilinear_npp_pattern_seq
label_desc: Use image node_id 1 for calling the DebayerTest obj's underlying member method code with example usage: obj.setUpClass(cls) without return types